Pin rules_swift 3.4.2 so Bazel works on Windows hosts with Swiftbuild/rules-swift-windows

rules_swift reaches the module graph through protobuf and rules_apple,
resolved to 3.1.2. Its Windows autoconfiguration runs whenever
swiftc.exe is on PATH and, up to 3.4.1, writes a toolchain that
indexes APPLE_PLATFORMS_CONSTRAINTS with the undefined name arch, so
every Bazel build on such a host failed in analysis with "name 'arch'
is not defined". The hosted runners have no Swift, which is why CI
never saw it.

A single_version_override selects 3.4.2, the first fixed release with
the same compatibility level. It needs protobuf 29 and apple_support
1.24.2, both already satisfied by the graph (protobuf stays at 33.4);
nlohmann_json, only used by rules_swift's own tools, moves to
3.12.0.bcr.1 in the lockfile.

Verified on Windows with Swift 6.4.1 on PATH: bazel test
//tests/Progmasoft:property_tests passes, where it failed before.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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